| /* SPDX-License-Identifier: GPL-2.0 */ |
| /* |
| * Copyright (c) 2016, Avago Technologies |
| */ |
| |
| #ifndef _NVME_FC_DRIVER_H |
| #define _NVME_FC_DRIVER_H 1 |
| |
| |
| /* |
| * ********************** LLDD FC-NVME Host API ******************** |
| * |
| * For FC LLDD's that are the NVME Host role. |
| * |
| * ****************************************************************** |
| */ |
| |
| |
| |
| /** |
| * struct nvme_fc_port_info - port-specific ids and FC connection-specific |
| * data element used during NVME Host role |
| * registrations |
| * |
| * Static fields describing the port being registered: |
| * @node_name: FC WWNN for the port |
| * @port_name: FC WWPN for the port |
| * @port_role: What NVME roles are supported (see FC_PORT_ROLE_xxx) |
| * @dev_loss_tmo: maximum delay for reconnects to an association on |
| * this device. Used only on a remoteport. |
| * |
| * Initialization values for dynamic port fields: |
| * @port_id: FC N_Port_ID currently assigned the port. Upper 8 bits must |
| * be set to 0. |
| */ |
| struct nvme_fc_port_info { |
| u64 node_name; |
| u64 port_name; |
| u32 port_role; |
| u32 port_id; |
| u32 dev_loss_tmo; |
| }; |
| |
| |
| /** |
| * struct nvmefc_ls_req - Request structure passed from NVME-FC transport |
| * to LLDD in order to perform a NVME FC-4 LS |
| * request and obtain a response. |
| * |
| * Values set by the NVME-FC layer prior to calling the LLDD ls_req |
| * entrypoint. |
| * @rqstaddr: pointer to request buffer |
| * @rqstdma: PCI DMA address of request buffer |
| * @rqstlen: Length, in bytes, of request buffer |
| * @rspaddr: pointer to response buffer |
| * @rspdma: PCI DMA address of response buffer |
| * @rsplen: Length, in bytes, of response buffer |
| * @timeout: Maximum amount of time, in seconds, to wait for the LS response. |
| * If timeout exceeded, LLDD to abort LS exchange and complete |
| * LS request with error status. |
| * @private: pointer to memory allocated alongside the ls request structure |
| * that is specifically for the LLDD to use while processing the |
| * request. The length of the buffer corresponds to the |
| * lsrqst_priv_sz value specified in the nvme_fc_port_template |
| * supplied by the LLDD. |
| * @done: The callback routine the LLDD is to invoke upon completion of |
| * the LS request. req argument is the pointer to the original LS |
| * request structure. Status argument must be 0 upon success, a |
| * negative errno on failure (example: -ENXIO). |
| */ |
| struct nvmefc_ls_req { |
| void *rqstaddr; |
| dma_addr_t rqstdma; |
| u32 rqstlen; |
| void *rspaddr; |
| dma_addr_t rspdma; |
| u32 rsplen; |
| u32 timeout; |
| |
| void *private; |
| |
| void (*done)(struct nvmefc_ls_req *req, int status); |
| |
| } __aligned(sizeof(u64)); /* alignment for other things alloc'd with */ |
| |
| |
| enum nvmefc_fcp_datadir { |
| NVMEFC_FCP_NODATA, /* payload_length and sg_cnt will be zero */ |
| NVMEFC_FCP_WRITE, |
| NVMEFC_FCP_READ, |
| }; |
| |
| |
| /** |
| * struct nvmefc_fcp_req - Request structure passed from NVME-FC transport |
| * to LLDD in order to perform a NVME FCP IO operation. |
| * |
| * Values set by the NVME-FC layer prior to calling the LLDD fcp_io |
| * entrypoint. |
| * @cmdaddr: pointer to the FCP CMD IU buffer |
| * @rspaddr: pointer to the FCP RSP IU buffer |
| * @cmddma: PCI DMA address of the FCP CMD IU buffer |
| * @rspdma: PCI DMA address of the FCP RSP IU buffer |
| * @cmdlen: Length, in bytes, of the FCP CMD IU buffer |
| * @rsplen: Length, in bytes, of the FCP RSP IU buffer |
| * @payload_length: Length of DATA_IN or DATA_OUT payload data to transfer |
| * @sg_table: scatter/gather structure for payload data |
| * @first_sgl: memory for 1st scatter/gather list segment for payload data |
| * @sg_cnt: number of elements in the scatter/gather list |
| * @io_dir: direction of the FCP request (see NVMEFC_FCP_xxx) |
| * @sqid: The nvme SQID the command is being issued on |
| * @done: The callback routine the LLDD is to invoke upon completion of |
| * the FCP operation. req argument is the pointer to the original |
| * FCP IO operation. |
| * @private: pointer to memory allocated alongside the FCP operation |
| * request structure that is specifically for the LLDD to use |
| * while processing the operation. The length of the buffer |
| * corresponds to the fcprqst_priv_sz value specified in the |
| * nvme_fc_port_template supplied by the LLDD. |
| * |
| * Values set by the LLDD indicating completion status of the FCP operation. |
| * Must be set prior to calling the done() callback. |
| * @transferred_length: amount of payload data, in bytes, that were |
| * transferred. Should equal payload_length on success. |
| * @rcv_rsplen: length, in bytes, of the FCP RSP IU received. |
| * @status: Completion status of the FCP operation. must be 0 upon success, |
| * negative errno value upon failure (ex: -EIO). Note: this is |
| * NOT a reflection of the NVME CQE completion status. Only the |
| * status of the FCP operation at the NVME-FC level. |
| */ |
| struct nvmefc_fcp_req { |
| void *cmdaddr; |
| void *rspaddr; |
| dma_addr_t cmddma; |
| dma_addr_t rspdma; |
| u16 cmdlen; |
| u16 rsplen; |
| |
| u32 payload_length; |
| struct sg_table sg_table; |
| struct scatterlist *first_sgl; |
| int sg_cnt; |
| enum nvmefc_fcp_datadir io_dir; |
| |
| __le16 sqid; |
| |
| void (*done)(struct nvmefc_fcp_req *req); |
| |
| void *private; |
| |
| u32 transferred_length; |
| u16 rcv_rsplen; |
| u32 status; |
| } __aligned(sizeof(u64)); /* alignment for other things alloc'd with */ |
| |
| |
| /* |
| * Direct copy of fc_port_state enum. For later merging |
| */ |
| enum nvme_fc_obj_state { |
| FC_OBJSTATE_UNKNOWN, |
| FC_OBJSTATE_NOTPRESENT, |
| FC_OBJSTATE_ONLINE, |
| FC_OBJSTATE_OFFLINE, /* User has taken Port Offline */ |
| FC_OBJSTATE_BLOCKED, |
| FC_OBJSTATE_BYPASSED, |
| FC_OBJSTATE_DIAGNOSTICS, |
| FC_OBJSTATE_LINKDOWN, |
| FC_OBJSTATE_ERROR, |
| FC_OBJSTATE_LOOPBACK, |
| FC_OBJSTATE_DELETED, |
| }; |
| |
| |
| /** |
| * struct nvme_fc_local_port - structure used between NVME-FC transport and |
| * a LLDD to reference a local NVME host port. |
| * Allocated/created by the nvme_fc_register_localport() |
| * transport interface. |
| * |
| * Fields with static values for the port. Initialized by the |
| * port_info struct supplied to the registration call. |
| * @port_num: NVME-FC transport host port number |
| * @port_role: NVME roles are supported on the port (see FC_PORT_ROLE_xxx) |
| * @node_name: FC WWNN for the port |
| * @port_name: FC WWPN for the port |
| * @private: pointer to memory allocated alongside the local port |
| * structure that is specifically for the LLDD to use. |
| * The length of the buffer corresponds to the local_priv_sz |
| * value specified in the nvme_fc_port_template supplied by |
| * the LLDD. |
| * @dev_loss_tmo: maximum delay for reconnects to an association on |
| * this device. To modify, lldd must call |
| * nvme_fc_set_remoteport_devloss(). |
| * |
| * Fields with dynamic values. Values may change base on link state. LLDD |
| * may reference fields directly to change them. Initialized by the |
| * port_info struct supplied to the registration call. |
| * @port_id: FC N_Port_ID currently assigned the port. Upper 8 bits must |
| * be set to 0. |
| * @port_state: Operational state of the port. |
| */ |
| struct nvme_fc_local_port { |
| /* static/read-only fields */ |
| u32 port_num; |
| u32 port_role; |
| u64 node_name; |
| u64 port_name; |
| |
| void *private; |
| |
| /* dynamic fields */ |
| u32 port_id; |
| enum nvme_fc_obj_state port_state; |
| } __aligned(sizeof(u64)); /* alignment for other things alloc'd with */ |
| |
| |
| /** |
| * struct nvme_fc_remote_port - structure used between NVME-FC transport and |
| * a LLDD to reference a remote NVME subsystem port. |
| * Allocated/created by the nvme_fc_register_remoteport() |
| * transport interface. |
| * |
| * Fields with static values for the port. Initialized by the |
| * port_info struct supplied to the registration call. |
| * @port_num: NVME-FC transport remote subsystem port number |
| * @port_role: NVME roles are supported on the port (see FC_PORT_ROLE_xxx) |
| * @node_name: FC WWNN for the port |
| * @port_name: FC WWPN for the port |
| * @localport: pointer to the NVME-FC local host port the subsystem is |
| * connected to. |
| * @private: pointer to memory allocated alongside the remote port |
| * structure that is specifically for the LLDD to use. |
| * The length of the buffer corresponds to the remote_priv_sz |
| * value specified in the nvme_fc_port_template supplied by |
| * the LLDD. |
| * |
| * Fields with dynamic values. Values may change base on link or login |
| * state. LLDD may reference fields directly to change them. Initialized by |
| * the port_info struct supplied to the registration call. |
| * @port_id: FC N_Port_ID currently assigned the port. Upper 8 bits must |
| * be set to 0. |
| * @port_state: Operational state of the remote port. Valid values are |
| * ONLINE or UNKNOWN. |
| */ |
| struct nvme_fc_remote_port { |
| /* static fields */ |
| u32 port_num; |
| u32 port_role; |
| u64 node_name; |
| u64 port_name; |
| struct nvme_fc_local_port *localport; |
| void *private; |
| u32 dev_loss_tmo; |
| |
| /* dynamic fields */ |
| u32 port_id; |
| enum nvme_fc_obj_state port_state; |
| } __aligned(sizeof(u64)); /* alignment for other things alloc'd with */ |
| |
| |
| /** |
| * struct nvme_fc_port_template - structure containing static entrypoints and |
| * operational parameters for an LLDD that supports NVME host |
| * behavior. Passed by reference in port registrations. |
| * NVME-FC transport remembers template reference and may |
| * access it during runtime operation. |
| * |
| * Host/Initiator Transport Entrypoints/Parameters: |
| * |
| * @localport_delete: The LLDD initiates deletion of a localport via |
| * nvme_fc_deregister_localport(). However, the teardown is |
| * asynchronous. This routine is called upon the completion of the |
| * teardown to inform the LLDD that the localport has been deleted. |
| * Entrypoint is Mandatory. |
| * |
| * @remoteport_delete: The LLDD initiates deletion of a remoteport via |
| * nvme_fc_deregister_remoteport(). However, the teardown is |
| * asynchronous. This routine is called upon the completion of the |
| * teardown to inform the LLDD that the remoteport has been deleted. |
| * Entrypoint is Mandatory. |
| * |
| * @create_queue: Upon creating a host<->controller association, queues are |
| * created such that they can be affinitized to cpus/cores. This |
| * callback into the LLDD to notify that a controller queue is being |
| * created. The LLDD may choose to allocate an associated hw queue |
| * or map it onto a shared hw queue. Upon return from the call, the |
| * LLDD specifies a handle that will be given back to it for any |
| * command that is posted to the controller queue. The handle can |
| * be used by the LLDD to map quickly to the proper hw queue for |
| * command execution. The mask of cpu's that will map to this queue |
| * at the block-level is also passed in. The LLDD should use the |
| * queue id and/or cpu masks to ensure proper affinitization of the |
| * controller queue to the hw queue. |
| * Entrypoint is Optional. |
| * |
| * @delete_queue: This is the inverse of the crete_queue. During |
| * host<->controller association teardown, this routine is called |
| * when a controller queue is being terminated. Any association with |
| * a hw queue should be termined. If there is a unique hw queue, the |
| * hw queue should be torn down. |
| * Entrypoint is Optional. |
| * |
| * @poll_queue: Called to poll for the completion of an io on a blk queue. |
| * Entrypoint is Optional. |
| * |
| * @ls_req: Called to issue a FC-NVME FC-4 LS service request. |
| * The nvme_fc_ls_req structure will fully describe the buffers for |
| * the request payload and where to place the response payload. The |
| * LLDD is to allocate an exchange, issue the LS request, obtain the |
| * LS response, and call the "done" routine specified in the request |
| * structure (argument to done is the ls request structure itself). |
| * Entrypoint is Mandatory. |
| * |
| * @fcp_io: called to issue a FC-NVME I/O request. The I/O may be for |
| * an admin queue or an i/o queue. The nvmefc_fcp_req structure will |
| * fully describe the io: the buffer containing the FC-NVME CMD IU |
| * (which contains the SQE), the sg list for the payload if applicable, |
| * and the buffer to place the FC-NVME RSP IU into. The LLDD will |
| * complete the i/o, indicating the amount of data transferred or |
| * any transport error, and call the "done" routine specified in the |
| * request structure (argument to done is the fcp request structure |
| * itself). |
| * Entrypoint is Mandatory. |
| * |
| * @ls_abort: called to request the LLDD to abort the indicated ls request. |
| * The call may return before the abort has completed. After aborting |
| * the request, the LLDD must still call the ls request done routine |
| * indicating an FC transport Aborted status. |
| * Entrypoint is Mandatory. |
| * |
| * @fcp_abort: called to request the LLDD to abort the indicated fcp request. |
| * The call may return before the abort has completed. After aborting |
| * the request, the LLDD must still call the fcp request done routine |
| * indicating an FC transport Aborted status. |
| * Entrypoint is Mandatory. |
| * |
| * @max_hw_queues: indicates the maximum number of hw queues the LLDD |
| * supports for cpu affinitization. |
| * Value is Mandatory. Must be at least 1. |
| * |
| * @max_sgl_segments: indicates the maximum number of sgl segments supported |
| * by the LLDD |
| * Value is Mandatory. Must be at least 1. Recommend at least 256. |
| * |
| * @max_dif_sgl_segments: indicates the maximum number of sgl segments |
| * supported by the LLDD for DIF operations. |
| * Value is Mandatory. Must be at least 1. Recommend at least 256. |
| * |
| * @dma_boundary: indicates the dma address boundary where dma mappings |
| * will be split across. |
| * Value is Mandatory. Typical value is 0xFFFFFFFF to split across |
| * 4Gig address boundarys |
| * |
| * @local_priv_sz: The LLDD sets this field to the amount of additional |
| * memory that it would like fc nvme layer to allocate on the LLDD's |
| * behalf whenever a localport is allocated. The additional memory |
| * area solely for the of the LLDD and its location is specified by |
| * the localport->private pointer. |
| * Value is Mandatory. Allowed to be zero. |
| * |
| * @remote_priv_sz: The LLDD sets this field to the amount of additional |
| * memory that it would like fc nvme layer to allocate on the LLDD's |
| * behalf whenever a remoteport is allocated. The additional memory |
| * area solely for the of the LLDD and its location is specified by |
| * the remoteport->private pointer. |
| * Value is Mandatory. Allowed to be zero. |
| * |
| * @lsrqst_priv_sz: The LLDD sets this field to the amount of additional |
| * memory that it would like fc nvme layer to allocate on the LLDD's |
| * behalf whenever a ls request structure is allocated. The additional |
| * memory area solely for the of the LLDD and its location is |
| * specified by the ls_request->private pointer. |
| * Value is Mandatory. Allowed to be zero. |
| * |
| * @fcprqst_priv_sz: The LLDD sets this field to the amount of additional |
| * memory that it would like fc nvme layer to allocate on the LLDD's |
| * behalf whenever a fcp request structure is allocated. The additional |
| * memory area solely for the of the LLDD and its location is |
| * specified by the fcp_request->private pointer. |
| * Value is Mandatory. Allowed to be zero. |
| */ |
| struct nvme_fc_port_template { |
| /* initiator-based functions */ |
| void (*localport_delete)(struct nvme_fc_local_port *); |
| void (*remoteport_delete)(struct nvme_fc_remote_port *); |
| int (*create_queue)(struct nvme_fc_local_port *, |
| unsigned int qidx, u16 qsize, |
| void **handle); |
| void (*delete_queue)(struct nvme_fc_local_port *, |
| unsigned int qidx, void *handle); |
| int (*ls_req)(struct nvme_fc_local_port *, |
| struct nvme_fc_remote_port *, |
| struct nvmefc_ls_req *); |
| int (*fcp_io)(struct nvme_fc_local_port *, |
| struct nvme_fc_remote_port *, |
| void *hw_queue_handle, |
| struct nvmefc_fcp_req *); |
| void (*ls_abort)(struct nvme_fc_local_port *, |
| struct nvme_fc_remote_port *, |
| struct nvmefc_ls_req *); |
| void (*fcp_abort)(struct nvme_fc_local_port *, |
| struct nvme_fc_remote_port *, |
| void *hw_queue_handle, |
| struct nvmefc_fcp_req *); |
| |
| u32 max_hw_queues; |
| u16 max_sgl_segments; |
| u16 max_dif_sgl_segments; |
| u64 dma_boundary; |
| |
| /* sizes of additional private data for data structures */ |
| u32 local_priv_sz; |
| u32 remote_priv_sz; |
| u32 lsrqst_priv_sz; |
| u32 fcprqst_priv_sz; |
| }; |
| |
| |
| /* |
| * Initiator/Host functions |
| */ |
| |
| int nvme_fc_register_localport(struct nvme_fc_port_info *pinfo, |
| struct nvme_fc_port_template *template, |
| struct device *dev, |
| struct nvme_fc_local_port **lport_p); |
| |
| int nvme_fc_unregister_localport(struct nvme_fc_local_port *localport); |
| |
| int nvme_fc_register_remoteport(struct nvme_fc_local_port *localport, |
| struct nvme_fc_port_info *pinfo, |
| struct nvme_fc_remote_port **rport_p); |
| |
| int nvme_fc_unregister_remoteport(struct nvme_fc_remote_port *remoteport); |
| |
| void nvme_fc_rescan_remoteport(struct nvme_fc_remote_port *remoteport); |
| |
| int nvme_fc_set_remoteport_devloss(struct nvme_fc_remote_port *remoteport, |
| u32 dev_loss_tmo); |
| |
| |
| /* |
| * *************** LLDD FC-NVME Target/Subsystem API *************** |
| * |
| * For FC LLDD's that are the NVME Subsystem role |
| * |
| * ****************************************************************** |
| */ |
| |
| /** |
| * struct nvmet_fc_port_info - port-specific ids and FC connection-specific |
| * data element used during NVME Subsystem role |
| * registrations |
| * |
| * Static fields describing the port being registered: |
| * @node_name: FC WWNN for the port |
| * @port_name: FC WWPN for the port |
| * |
| * Initialization values for dynamic port fields: |
| * @port_id: FC N_Port_ID currently assigned the port. Upper 8 bits must |
| * be set to 0. |
| */ |
| struct nvmet_fc_port_info { |
| u64 node_name; |
| u64 port_name; |
| u32 port_id; |
| }; |
| |
| |
| /** |
| * struct nvmefc_tgt_ls_req - Structure used between LLDD and NVMET-FC |
| * layer to represent the exchange context for |
| * a FC-NVME Link Service (LS). |
| * |
| * The structure is allocated by the LLDD whenever a LS Request is received |
| * from the FC link. The address of the structure is passed to the nvmet-fc |
| * layer via the nvmet_fc_rcv_ls_req() call. The address of the structure |
| * will be passed back to the LLDD when the response is to be transmit. |
| * The LLDD is to use the address to map back to the LLDD exchange structure |
| * which maintains information such as the targetport the LS was received |
| * on, the remote FC NVME initiator that sent the LS, and any FC exchange |
| * context. Upon completion of the LS response transmit, the address of the |
| * structure will be passed back to the LS rsp done() routine, allowing the |
| * nvmet-fc layer to release dma resources. Upon completion of the done() |
| * routine, no further access will be made by the nvmet-fc layer and the |
| * LLDD can de-allocate the structure. |
| * |
| * Field initialization: |
| * At the time of the nvmet_fc_rcv_ls_req() call, there is no content that |
| * is valid in the structure. |
| * |
| * When the structure is used for the LLDD->xmt_ls_rsp() call, the nvmet-fc |
| * layer will fully set the fields in order to specify the response |
| * payload buffer and its length as well as the done routine to be called |
| * upon compeletion of the transmit. The nvmet-fc layer will also set a |
| * private pointer for its own use in the done routine. |
| * |
| * Values set by the NVMET-FC layer prior to calling the LLDD xmt_ls_rsp |
| * entrypoint. |
| * @rspbuf: pointer to the LS response buffer |
| * @rspdma: PCI DMA address of the LS response buffer |
| * @rsplen: Length, in bytes, of the LS response buffer |
| * @done: The callback routine the LLDD is to invoke upon completion of |
| * transmitting the LS response. req argument is the pointer to |
| * the original ls request. |
| * @nvmet_fc_private: pointer to an internal NVMET-FC layer structure used |
| * as part of the NVMET-FC processing. The LLDD is not to access |
| * this pointer. |
| */ |
| struct nvmefc_tgt_ls_req { |
| void *rspbuf; |
| dma_addr_t rspdma; |
| u16 rsplen; |
| |
| void (*done)(struct nvmefc_tgt_ls_req *req); |
| void *nvmet_fc_private; /* LLDD is not to access !! */ |
| }; |
| |
| /* Operations that NVME-FC layer may request the LLDD to perform for FCP */ |
| enum { |
| NVMET_FCOP_READDATA = 1, /* xmt data to initiator */ |
| NVMET_FCOP_WRITEDATA = 2, /* xmt data from initiator */ |
| NVMET_FCOP_READDATA_RSP = 3, /* xmt data to initiator and send |
| * rsp as well |
| */ |
| NVMET_FCOP_RSP = 4, /* send rsp frame */ |
| }; |
| |
| /** |
| * struct nvmefc_tgt_fcp_req - Structure used between LLDD and NVMET-FC |
| * layer to represent the exchange context and |
| * the specific FC-NVME IU operation(s) to perform |
| * for a FC-NVME FCP IO. |
| * |
| * Structure used between LLDD and nvmet-fc layer to represent the exchange |
| * context for a FC-NVME FCP I/O operation (e.g. a nvme sqe, the sqe-related |
| * memory transfers, and its assocated cqe transfer). |
| * |
| * The structure is allocated by the LLDD whenever a FCP CMD IU is received |
| * from the FC link. The address of the structure is passed to the nvmet-fc |
| * layer via the nvmet_fc_rcv_fcp_req() call. The address of the structure |
| * will be passed back to the LLDD for the data operations and transmit of |
| * the response. The LLDD is to use the address to map back to the LLDD |
| * exchange structure which maintains information such as the targetport |
| * the FCP I/O was received on, the remote FC NVME initiator that sent the |
| * FCP I/O, and any FC exchange context. Upon completion of the FCP target |
| * operation, the address of the structure will be passed back to the FCP |
| * op done() routine, allowing the nvmet-fc layer to release dma resources. |
| * Upon completion of the done() routine for either RSP or ABORT ops, no |
| * further access will be made by the nvmet-fc layer and the LLDD can |
| * de-allocate the structure. |
| * |
| * Field initialization: |
| * At the time of the nvmet_fc_rcv_fcp_req() call, there is no content that |
| * is valid in the structure. |
| * |
| * When the structure is used for an FCP target operation, the nvmet-fc |
| * layer will fully set the fields in order to specify the scattergather |
| * list, the transfer length, as well as the done routine to be called |
| * upon compeletion of the operation. The nvmet-fc layer will also set a |
| * private pointer for its own use in the done routine. |
| * |
| * Values set by the NVMET-FC layer prior to calling the LLDD fcp_op |
| * entrypoint. |
| * @op: Indicates the FCP IU operation to perform (see NVMET_FCOP_xxx) |
| * @hwqid: Specifies the hw queue index (0..N-1, where N is the |
| * max_hw_queues value from the LLD's nvmet_fc_target_template) |
| * that the operation is to use. |
| * @offset: Indicates the DATA_OUT/DATA_IN payload offset to be tranferred. |
| * Field is only valid on WRITEDATA, READDATA, or READDATA_RSP ops. |
| * @timeout: amount of time, in seconds, to wait for a response from the NVME |
| * host. A value of 0 is an infinite wait. |
| * Valid only for the following ops: |
| * WRITEDATA: caps the wait for data reception |
| * READDATA_RSP & RSP: caps wait for FCP_CONF reception (if used) |
| * @transfer_length: the length, in bytes, of the DATA_OUT or DATA_IN payload |
| * that is to be transferred. |
| * Valid only for the WRITEDATA, READDATA, or READDATA_RSP ops. |
| * @ba_rjt: Contains the BA_RJT payload that is to be transferred. |
| * Valid only for the NVMET_FCOP_BA_RJT op. |
| * @sg: Scatter/gather list for the DATA_OUT/DATA_IN payload data. |
| * Valid only for the WRITEDATA, READDATA, or READDATA_RSP ops. |
| * @sg_cnt: Number of valid entries in the scatter/gather list. |
| * Valid only for the WRITEDATA, READDATA, or READDATA_RSP ops. |
| * @rspaddr: pointer to the FCP RSP IU buffer to be transmit |
| * Used by RSP and READDATA_RSP ops |
| * @rspdma: PCI DMA address of the FCP RSP IU buffer |
| * Used by RSP and READDATA_RSP ops |
| * @rsplen: Length, in bytes, of the FCP RSP IU buffer |
| * Used by RSP and READDATA_RSP ops |
| * @done: The callback routine the LLDD is to invoke upon completion of |
| * the operation. req argument is the pointer to the original |
| * FCP subsystem op request. |
| * @nvmet_fc_private: pointer to an internal NVMET-FC layer structure used |
| * as part of the NVMET-FC processing. The LLDD is not to |
| * reference this field. |
| * |
| * Values set by the LLDD indicating completion status of the FCP operation. |
| * Must be set prior to calling the done() callback. |
| * @transferred_length: amount of DATA_OUT payload data received by a |
| * a WRITEDATA operation. If not a WRITEDATA operation, value must |
| * be set to 0. Should equal transfer_length on success. |
| * @fcp_error: status of the FCP operation. Must be 0 on success; on failure |
| * must be a NVME_SC_FC_xxxx value. |
| */ |
| struct nvmefc_tgt_fcp_req { |
| u8 op; |
| u16 hwqid; |
| u32 offset; |
| u32 timeout; |
| u32 transfer_length; |
| struct fc_ba_rjt ba_rjt; |
| struct scatterlist *sg; |
| int sg_cnt; |
| void *rspaddr; |
| dma_addr_t rspdma; |
| u16 rsplen; |
| |
| void (*done)(struct nvmefc_tgt_fcp_req *); |
| |
| void *nvmet_fc_private; /* LLDD is not to access !! */ |
| |
| u32 transferred_length; |
| int fcp_error; |
| }; |
| |
| |
| /* Target Features (Bit fields) LLDD supports */ |
| enum { |
| NVMET_FCTGTFEAT_READDATA_RSP = (1 << 0), |
| /* Bit 0: supports the NVMET_FCPOP_READDATA_RSP op, which |
| * sends (the last) Read Data sequence followed by the RSP |
| * sequence in one LLDD operation. Errors during Data |
| * sequence transmit must not allow RSP sequence to be sent. |
| */ |
| }; |
| |
| |
| /** |
| * struct nvmet_fc_target_port - structure used between NVME-FC transport and |
| * a LLDD to reference a local NVME subsystem port. |
| * Allocated/created by the nvme_fc_register_targetport() |
| * transport interface. |
| * |
| * Fields with static values for the port. Initialized by the |
| * port_info struct supplied to the registration call. |
| * @port_num: NVME-FC transport subsytem port number |
| * @node_name: FC WWNN for the port |
| * @port_name: FC WWPN for the port |
| * @private: pointer to memory allocated alongside the local port |
| * structure that is specifically for the LLDD to use. |
| * The length of the buffer corresponds to the target_priv_sz |
| * value specified in the nvme_fc_target_template supplied by |
| * the LLDD. |
| * |
| * Fields with dynamic values. Values may change base on link state. LLDD |
| * may reference fields directly to change them. Initialized by the |
| * port_info struct supplied to the registration call. |
| * @port_id: FC N_Port_ID currently assigned the port. Upper 8 bits must |
| * be set to 0. |
| * @port_state: Operational state of the port. |
| */ |
| struct nvmet_fc_target_port { |
| /* static/read-only fields */ |
| u32 port_num; |
| u64 node_name; |
| u64 port_name; |
| |
| void *private; |
| |
| /* dynamic fields */ |
| u32 port_id; |
| enum nvme_fc_obj_state port_state; |
| } __aligned(sizeof(u64)); /* alignment for other things alloc'd with */ |
| |
| |
| /** |
| * struct nvmet_fc_target_template - structure containing static entrypoints |
| * and operational parameters for an LLDD that supports NVME |
| * subsystem behavior. Passed by reference in port |
| * registrations. NVME-FC transport remembers template |
| * reference and may access it during runtime operation. |
| * |
| * Subsystem/Target Transport Entrypoints/Parameters: |
| * |
| * @targetport_delete: The LLDD initiates deletion of a targetport via |
| * nvmet_fc_unregister_targetport(). However, the teardown is |
| * asynchronous. This routine is called upon the completion of the |
| * teardown to inform the LLDD that the targetport has been deleted. |
| * Entrypoint is Mandatory. |
| * |
| * @xmt_ls_rsp: Called to transmit the response to a FC-NVME FC-4 LS service. |
| * The nvmefc_tgt_ls_req structure is the same LLDD-supplied exchange |
| * structure specified in the nvmet_fc_rcv_ls_req() call made when |
| * the LS request was received. The structure will fully describe |
| * the buffers for the response payload and the dma address of the |
| * payload. The LLDD is to transmit the response (or return a non-zero |
| * errno status), and upon completion of the transmit, call the |
| * "done" routine specified in the nvmefc_tgt_ls_req structure |
| * (argument to done is the ls reqwuest structure itself). |
| * After calling the done routine, the LLDD shall consider the |
| * LS handling complete and the nvmefc_tgt_ls_req structure may |
| * be freed/released. |
| * Entrypoint is Mandatory. |
| * |
| * @fcp_op: Called to perform a data transfer or transmit a response. |
| * The nvmefc_tgt_fcp_req structure is the same LLDD-supplied |
| * exchange structure specified in the nvmet_fc_rcv_fcp_req() call |
| * made when the FCP CMD IU was received. The op field in the |
| * structure shall indicate the operation for the LLDD to perform |
| * relative to the io. |
| * NVMET_FCOP_READDATA operation: the LLDD is to send the |
| * payload data (described by sglist) to the host in 1 or |
| * more FC sequences (preferrably 1). Note: the fc-nvme layer |
| * may call the READDATA operation multiple times for longer |
| * payloads. |
| * NVMET_FCOP_WRITEDATA operation: the LLDD is to receive the |
| * payload data (described by sglist) from the host via 1 or |
| * more FC sequences (preferrably 1). The LLDD is to generate |
| * the XFER_RDY IU(s) corresponding to the data being requested. |
| * Note: the FC-NVME layer may call the WRITEDATA operation |
| * multiple times for longer payloads. |
| * NVMET_FCOP_READDATA_RSP operation: the LLDD is to send the |
| * payload data (described by sglist) to the host in 1 or |
| * more FC sequences (preferrably 1). If an error occurs during |
| * payload data transmission, the LLDD is to set the |
| * nvmefc_tgt_fcp_req fcp_error and transferred_length field, then |
| * consider the operation complete. On error, the LLDD is to not |
| * transmit the FCP_RSP iu. If all payload data is transferred |
| * successfully, the LLDD is to update the nvmefc_tgt_fcp_req |
| * transferred_length field and may subsequently transmit the |
| * FCP_RSP iu payload (described by rspbuf, rspdma, rsplen). |
| * If FCP_CONF is supported, the LLDD is to await FCP_CONF |
| * reception to confirm the RSP reception by the host. The LLDD |
| * may retramsit the FCP_RSP iu if necessary per FC-NVME. Upon |
| * transmission of the FCP_RSP iu if FCP_CONF is not supported, |
| * or upon success/failure of FCP_CONF if it is supported, the |
| * LLDD is to set the nvmefc_tgt_fcp_req fcp_error field and |
| * consider the operation complete. |
| * NVMET_FCOP_RSP: the LLDD is to transmit the FCP_RSP iu payload |
| * (described by rspbuf, rspdma, rsplen). If FCP_CONF is |
| * supported, the LLDD is to await FCP_CONF reception to confirm |
| * the RSP reception by the host. The LLDD may retramsit the |
| * FCP_RSP iu if FCP_CONF is not received per FC-NVME. Upon |
| * transmission of the FCP_RSP iu if FCP_CONF is not supported, |
| * or upon success/failure of FCP_CONF if it is supported, the |
| * LLDD is to set the nvmefc_tgt_fcp_req fcp_error field and |
| * consider the operation complete. |
| * Upon completing the indicated operation, the LLDD is to set the |
| * status fields for the operation (tranferred_length and fcp_error |
| * status) in the request, then call the "done" routine |
| * indicated in the fcp request. After the operation completes, |
| * regardless of whether the FCP_RSP iu was successfully transmit, |
| * the LLDD-supplied exchange structure must remain valid until the |
| * transport calls the fcp_req_release() callback to return ownership |
| * of the exchange structure back to the LLDD so that it may be used |
| * for another fcp command. |
| * Note: when calling the done routine for READDATA or WRITEDATA |
| * operations, the fc-nvme layer may immediate convert, in the same |
| * thread and before returning to the LLDD, the fcp operation to |
| * the next operation for the fcp io and call the LLDDs fcp_op |
| * call again. If fields in the fcp request are to be accessed post |
| * the done call, the LLDD should save their values prior to calling |
| * the done routine, and inspect the save values after the done |
| * routine. |
| * Returns 0 on success, -<errno> on failure (Ex: -EIO) |
| * Entrypoint is Mandatory. |
| * |
| * @fcp_abort: Called by the transport to abort an active command. |
| * The command may be in-between operations (nothing active in LLDD) |
| * or may have an active WRITEDATA operation pending. The LLDD is to |
| * initiate the ABTS process for the command and return from the |
| * callback. The ABTS does not need to be complete on the command. |
| * The fcp_abort callback inherently cannot fail. After the |
| * fcp_abort() callback completes, the transport will wait for any |
| * outstanding operation (if there was one) to complete, then will |
| * call the fcp_req_release() callback to return the command's |
| * exchange context back to the LLDD. |
| * Entrypoint is Mandatory. |
| * |
| * @fcp_req_release: Called by the transport to return a nvmefc_tgt_fcp_req |
| * to the LLDD after all operations on the fcp operation are complete. |
| * This may be due to the command completing or upon completion of |
| * abort cleanup. |
| * Entrypoint is Mandatory. |
| * |
| * @defer_rcv: Called by the transport to signal the LLLD that it has |
| * begun processing of a previously received NVME CMD IU. The LLDD |
| * is now free to re-use the rcv buffer associated with the |
| * nvmefc_tgt_fcp_req. |
| * Entrypoint is Optional. |
| * |
| * @discovery_event: Called by the transport to generate an RSCN |
| * change notifications to NVME initiators. The RSCN notifications |
| * should cause the initiator to rescan the discovery controller |
| * on the targetport. |
| * |
| * @max_hw_queues: indicates the maximum number of hw queues the LLDD |
| * supports for cpu affinitization. |
| * Value is Mandatory. Must be at least 1. |
| * |
| * @max_sgl_segments: indicates the maximum number of sgl segments supported |
| * by the LLDD |
| * Value is Mandatory. Must be at least 1. Recommend at least 256. |
| * |
| * @max_dif_sgl_segments: indicates the maximum number of sgl segments |
| * supported by the LLDD for DIF operations. |
| * Value is Mandatory. Must be at least 1. Recommend at least 256. |
| * |
| * @dma_boundary: indicates the dma address boundary where dma mappings |
| * will be split across. |
| * Value is Mandatory. Typical value is 0xFFFFFFFF to split across |
| * 4Gig address boundarys |
| * |
| * @target_features: The LLDD sets bits in this field to correspond to |
| * optional features that are supported by the LLDD. |
| * Refer to the NVMET_FCTGTFEAT_xxx values. |
| * Value is Mandatory. Allowed to be zero. |
| * |
| * @target_priv_sz: The LLDD sets this field to the amount of additional |
| * memory that it would like fc nvme layer to allocate on the LLDD's |
| * behalf whenever a targetport is allocated. The additional memory |
| * area solely for the of the LLDD and its location is specified by |
| * the targetport->private pointer. |
| * Value is Mandatory. Allowed to be zero. |
| */ |
| struct nvmet_fc_target_template { |
| void (*targetport_delete)(struct nvmet_fc_target_port *tgtport); |
| int (*xmt_ls_rsp)(struct nvmet_fc_target_port *tgtport, |
| struct nvmefc_tgt_ls_req *tls_req); |
| int (*fcp_op)(struct nvmet_fc_target_port *tgtport, |
| struct nvmefc_tgt_fcp_req *fcpreq); |
| void (*fcp_abort)(struct nvmet_fc_target_port *tgtport, |
| struct nvmefc_tgt_fcp_req *fcpreq); |
| void (*fcp_req_release)(struct nvmet_fc_target_port *tgtport, |
| struct nvmefc_tgt_fcp_req *fcpreq); |
| void (*defer_rcv)(struct nvmet_fc_target_port *tgtport, |
| struct nvmefc_tgt_fcp_req *fcpreq); |
| void (*discovery_event)(struct nvmet_fc_target_port *tgtport); |
| |
| u32 max_hw_queues; |
| u16 max_sgl_segments; |
| u16 max_dif_sgl_segments; |
| u64 dma_boundary; |
| |
| u32 target_features; |
| |
| u32 target_priv_sz; |
| }; |
| |
| |
| int nvmet_fc_register_targetport(struct nvmet_fc_port_info *portinfo, |
| struct nvmet_fc_target_template *template, |
| struct device *dev, |
| struct nvmet_fc_target_port **tgtport_p); |
| |
| int nvmet_fc_unregister_targetport(struct nvmet_fc_target_port *tgtport); |
| |
| int nvmet_fc_rcv_ls_req(struct nvmet_fc_target_port *tgtport, |
| struct nvmefc_tgt_ls_req *lsreq, |
| void *lsreqbuf, u32 lsreqbuf_len); |
| |
| int nvmet_fc_rcv_fcp_req(struct nvmet_fc_target_port *tgtport, |
| struct nvmefc_tgt_fcp_req *fcpreq, |
| void *cmdiubuf, u32 cmdiubuf_len); |
| |
| void nvmet_fc_rcv_fcp_abort(struct nvmet_fc_target_port *tgtport, |
| struct nvmefc_tgt_fcp_req *fcpreq); |
| |
| #endif /* _NVME_FC_DRIVER_H */ |
